Damping the oscillations of vehicles, in particular rail vehicles



Dec. 21, 1937. o. MYLIUS 2,102,907

DAMPING THEOSCILLA'I'IONS 0F VEHICLES, IN PARTICULAR RAIL VEHICLES Filed Nov. 26, 19:55

Patented Dec. 21,1937

UNITED STATE DAMPING THE CLES, IN PARTICULAR RAIL VEHICLES Otto Mylius, Berlin, Deutsclie Getriebe schrankter Haftung,

Application}n November 2 Germany, assignor to Gesellschaft mit be- Berlin, Germany a, 1935, Serial No. 51353 Germany April 2'7, 193! 4 Claims.

The object 'of the present invention is to pro-' vide an arrangement for damping the oscillations of vehicles, in particular rail vehicles. It

is' already known to make use of friction for damping these oscillations. Hitherto, however, only the friction which occurs in the supporting springs themselves when they bend has been made use of, in the case, that is to say, of laminated leaf springs. The damping obtained in this manner, however,

tice as the result of inequalities in the track.

The object of the invention is to provide additional friction beyondthat occurring in known methods in the springs themselves. I This object is attained according to the invention by so shaping or disposing the'members which take the loadand lie between the frame, the supporting springs and the axle boxes at suitable points, that when oscillations occur an'additional friction'is generated between the mutually moving surfaces of the frames, supporting springs, axle boxes and transmissionv mem ers.

In a particularly advantageous construction according to the invention, the load which is.

. thrown upon the chain formed wholly or in part by the supporting springs, axle box and trans-' mission members, produces a force component parallel to the longitudinal axis of the vehicle, by

. which force component the mutually moving .these parts 'by introducing surfaces are pressed against one another during oscillations.

the friction in all the parts which serve to transcontrasted with known arrangements in which the object in view has been 7 knife edges at the bearing surfaces, rollers and roller bearings.

The invention is illustrated in a variety of .modifications in the accompanying drawing in which v Fig. 1 is a side elevation of a bogey frame for a rail vehicle with the novel arrangement of springs, f

Fig. 2 is a side elevation of a single axle'in a modification.

Fig. 3 is a side elevation of a bogey frame in another modification,

In the embodiment of the invention shown in Fig. 1, the side carrying member of the bogey frame is indicatedby i. It has the usual forkshaped slots or guides 2 for the reception of the axle boxes 3, which can perform a vertical moveis not sufficient to counteract the oscillations which occur. in practo avoid friction in produced in the chain formed of the frame I,

the shackles or transmission members 5 and 6, the spring 4, and the axle box 3, a force component parallel with the longitudinal axis of the vehicle, which force component results in the 'axle box 3 being pressed continuously against one side of the fork or guide 2, that is to say against the cheek of the fork which lies on the lefthand side in the drawing. If now there ocours in. operation an up and down movement of the axle box 3 in the an additional friction on the lefthand cheek, which willin a short time damp out the oscillation.

The bogey frame shown in Fig. 1 has also in known manner at its centre a cradle 1 upon which there rests with a pivot the vehicle frame (not shown in the drawing). This cradle l is carried on both sides by the leaf springs 8 which in turnare linked by means of the shackles 9 and Ill to the frame I. According to the invention the shackle III. again is arranged at an incline, so that in operation there is produced a continuous pressure of the cradle 1 against the i stop plate ll of the frame which lies on the righthand side of the drawing.

According to the invention there can be used at all the points of friction a suitable coating such as artificial. rubber, india rubber, or the like.

The modification according to- Fig. 2 corresponds essentially with that of Fig. 1. There is here shown only a single axle with axle box 12 which is'guided in the, fork l3 of the frame l4. The spring I! is again suspended unsymmetrically with regard to the frame, the shackle It be-.

ing disposed at an inclination. o

In the modification shown in Fig. 3 the cradle is differently supported from the arrangement shown in Fig. 1. Upon undercarrying plate I! by means of .the hanging shackles i1 and ll, and on this underplate I! rest the springs 20. Upon these thererests the upper supporting plate 2| of the cradle 22. In consequence of the unsymmetrical suspension of the springs there is again produced a constant application of the cradle 22 againstthe stop "fork 2, there is produced the frame I is hung the plate 23 of the frame I. 'Here aisothe friction Lil means comprising a member site sides of the load-carrying surfaces can be coated with a suitable friction lining.

All the described modifications of the invention present the particular advantage that the increased damping by means of friction is effected merely by the peculiar formation of the usual individual parts. No extra oscillation damping devices have to be furnished, to be fitted at suitable points, such as dashpots or the like. Such additional devices naturally increase the cost of the vehicle, and this is entirely avoided by the present invention.

I claim: L

1. In a car truck, a side frame having a vertical guide slot therein, a load-carrying device mounted in theguide slot to therein under varying load conditions, and suspension means connecting the load-marrying device with the side frame; said suspension extending longitudinally of the side frame and bearing at an intermediate part thereof against the load-carrying device, and shackle members arranged asymmetrically on opposite sides of the load-carrying device and respectively connecting the ends of the longitudinally extending member with the side frame; the said suspension meanscompris ing said longitudinally extending member and said shackle members having at least one of said members providing a resilient connection with the cooperating members of said suspension means, and said suspension means operating to 1 provide a force component normally tending to I press the load-carrying device frictionally against the side frame.

2. In a car truck, a side frame having a vertical guide slot therein, a. load-carrying device mounted in the guide slot to move vertically therein under varying load conditions, and suspension means connecting the load-carrying device with the side frame; said suspension means comprising a resilient member extending longitudinally of. the side frame and bearing at an intermediate part thereof against the load-carrying device, and shackles arranged asymmetrically on oppospectively connecting the ends of the resilient member with the side frame;

move vertically device and re-.

said suspension means operating to 7 part thereof against the axle box, and shackles arranged on opposite sidesof the axle box in asymmetric relation to the axis of said axle box and respectively connecting the ends of the spring with the side frame; said suspension means operating to provide a force component normally tending to press the axle box against a side of the guide slot to dampen relative movement of the load carrying device with respect to the side frame.

4'. In a car truckia side frame having a vertical guide slot therein, a load-carrying device mounted in the .guide slot to move vertically therein under varying load conditions, and.sus-

pension means connecting the load-carrying de- I vice with said frame; said suspension means comprising a member extending longitudinally of the side frame and bearing at an intermediate part thereof against the load-carrying device, and shackle members arranged on opposite sides of the load carrying device and respectively connecting the ends of the longitudinally extending member with the side frame, the suspension means comprising said longitudinally extending member 'and said shackle, members having at least one of said members providing a'resilient connection with the cooperating members of said suspension means, one of said shackles being vertically disposedand the other shackle being inclined from the-vertical under normal load conditions, said suspension means operating to provide a force component normally tending to press the load-carrying device frictionally against a side of the guide slot to dampen relative movement of the load carrying device with respect tothe side frame.

OTIO MYLIUS. 

